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Article Abstract
Cry toxins produced by (Bt) are well known for their insecticidal activities against Lepidopteran, Dipteran, and Coleopteran species. In our previous work, we showed that trypsin-digested full-length Cry7Ab4 protoxin did not have insecticidal activity against larvae but strongly inhibited their growth. In this paper, we expressed and purified recombinant active Cry7Ab4 toxic core from for bioassay and identified its binding proteins. Interestingly, Cry7Ab4 toxic core exhibited activity to delay the pupation of larvae. Using protein pull-down assay, several proteins, including basic juvenile hormone-suppressible protein 1-like (BJSP-1), were identified from the midgut juice of larvae as putative Cry7Ab4-binding proteins. We showed that feeding larval Cry7Ab4 toxic core upregulated the level of BJSP-1 mRNA in the hemocytes and fat body and decreased the free juvenile hormone (JH) level in larvae. BJSP-1 interacted with Cry7Ab4 and bound to free JH . A possible mechanism of Cry7Ab4 in delaying the pupation of larvae was proposed.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9491089 | PMC |
| http://dx.doi.org/10.3389/fimmu.2022.849620 | DOI Listing |
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